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When a right-angle direction change is the bottleneck in your build, a mismatched or undersized bevel gear causes noise, backlash, and premature wear. These plastic nylon bevel gears are engineered for makers, robotics builders, and mechanical DIY enthusiasts who need a reliable 90° 1:2 transmission without the weight or cost of metal gearing.
Each gear is machined from engineering-grade nylon, offering a self-lubricating surface and low operating noise. Available in three module sizes — Mod 1, Mod 1.5, and Mod 2 — with tooth counts ranging from 15 to 40 teeth. Bore diameters span 5 mm to 25 mm (~0.20" to ~0.98"), with select variants featuring a precision keyway slot for positive shaft locking. Gears are sold individually; pair a pinion (small gear) with a wheel (large gear) to achieve the 1:2 ratio.
Typical use cases include DIY gearbox assemblies for CNC router axis drives, 3D printer extruder direction changes, RC vehicle differential builds, and educational robotics platforms requiring a compact right-angle nylon bevel gear set.
| Material | Engineering-grade nylon (PA) |
|---|---|
| Module (Mod) | 1 / 1.5 / 2 (see variant options) |
| Number of Teeth | 15T / 18T / 20T / 30T / 36T / 40T (see variant options) |
| Pressure Angle | 20° |
| Mesh Angle | 90° |
| Transmission Ratio | 1:2 (pinion : wheel) |
| Bore Diameter | 5 mm – 25 mm / ~0.20" – ~0.98" (see variant options) |
| Keyway | Available on select bore sizes: 4 mm, 5 mm, 6 mm, 8 mm keyway |
| Pitch Diameter (Mod 1, 15T) | ~15 mm / ~0.59" |
| Pitch Diameter (Mod 2, 40T) | ~80 mm / ~3.15" |
| Surface Finish | Natural nylon (off-white / beige) |
| Quantity per Order | 1 PCS (single gear; pair separately for 1:2 set) |
| Weight | See variant options |
The module (Mod) must match between the pinion and wheel gear you are pairing. Mod 1 is suited for light-load, fine-pitch applications; Mod 1.5 balances size and torque capacity for most hobby and maker builds; Mod 2 is recommended when higher torque or larger shaft diameters are required. If you are replacing an existing gear, measure the pitch diameter and divide by the tooth count to determine the module.
Yes. Each listing sells one gear (1 PCS). To achieve the 1:2 transmission ratio, you need to pair a pinion (smaller tooth count, e.g. 15T or 20T) with a wheel (larger tooth count, e.g. 30T or 40T) of the same module. Both gears must be the same Mod for correct meshing.
A plain bore relies on a set screw or press fit to secure the gear to the shaft, which is adequate for low-torque or intermittent-duty applications. If your application involves sustained torque, reversing loads, or high RPM, a keyway bore provides positive rotational locking and significantly reduces the risk of slippage. Select the keyway variant that matches your shaft's existing keyway dimensions.
Engineering-grade nylon (PA) offers a good strength-to-weight ratio and is suitable for moderate loads in dry or lightly lubricated environments. It is commonly used in robotics, 3D printers, CNC machines, and light automation. For heavy industrial loads, continuous high-torque duty, or elevated temperatures above ~80°C (176°F), metal gears would be more appropriate. If you are unsure, contact us with your load and speed requirements.
Yes. Nylon is inherently resistant to moisture, mild chemicals, and oxidation, making these gears suitable for environments where metal gears would rust or corrode. They do not require external lubrication for standard operation, though a light application of dry PTFE lubricant can extend service life in high-cycle applications.
Measure your shaft diameter with a caliper. The bore diameter listed in the variant name (e.g. "8 mm") is the inner hole diameter of the gear. For keyway variants, also confirm the keyway width on your shaft matches the keyway listed (e.g. "Keyway 5mm"). If your shaft diameter falls between listed sizes, contact us before ordering — do not attempt to force-fit a gear onto an oversized shaft.
Technically, a nylon gear of the same module and pressure angle will mesh with a metal gear. However, pairing nylon with metal is generally not recommended for sustained high-load use, as the harder metal teeth will accelerate wear on the nylon gear. For best longevity, pair nylon with nylon within the same module.
